RectModes.jl
Luna.RectModes.RectMode — Methodconvenience constructor for non-constant core index
Luna.RectModes.RectMode — Methodconvenience constructor assunming single gas filling and specified cladding
Luna.Modes.neff — Methodneff(m::RectMode, ω; z=0)effective index of rectangular mode with dielectric core and arbitrary (metal or dielectric) cladding.
Adapted from Laakmann, K. D. & Steier, W. H. Waveguides: characteristic modes of hollow rectangular dielectric waveguides. Appl. Opt., AO 15, 1334–1340 (1976).
I had to re-derive the result in order to get the complex cladding index contribution to the real part of neff.